package com.example.yueliang.filter;


import com.alibaba.fastjson.JSON;
import com.example.yueliang.common.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;


@Slf4j
@WebFilter(urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符   比如/**  与  /index.html能够匹配
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {


        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;


//        1.获取本次请求的URL
        String requestURI = request.getRequestURI();

        log.info("拦截的路径{}",requestURI);
//        定义不需要处理的请求路径
        String[] url = new String[]{
                "html/fonts",
                "/html/login.html",
                "/html/register.html",
                "/logout",
                "/common/**",
                "/js/**",
                "/css/**",
                "/images/**",
                "/favicon.ico",
                "/register",
                "/login"
        };

//        2.判断本次请求是否需要处理

        boolean check = check(url, requestURI);

//        3.如果不需要处理，则直接放行
        if (check){
            filterChain.doFilter(request,response);
            log.info("本次请求路径{}，不需要处理",requestURI);
            return;
        }
//        4.判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("user") != null){
            log.info("用户已登录");

//            Long empId = (Long) request.getSession().getAttribute("employee");
//            //将获取到的用户id保存到ThreadLocal中
//            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }

//        5.如果未登录则返回登录结果,通过输出流方式向客户端吧页面响应数据
//        String p = httpServletRequest.getContextPath();
        response.sendRedirect("/html/login.html");
        return;
//        response.addHeader("Login-Status", "NOTLOGIN");

    }


    //路径匹配，检查本次请求是否需要放行
    public boolean check(String[] urls,String requestURI){
        for(String url : urls){
            boolean match = PATH_MATCHER.match(url,requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
